The scandal surrounding VW has thrust nitric oxide (NOx) emissions from diesel vehicles into the limelight. Owing to the different engine technologies, these have always been higher than in gasoline-powered cars. On the other hand, diesel consumes less fuel. If a way can be found to "denitrify" diesel emissions efficiently, we would have an economical, clean engine. Researchers are thus working hard on optimizing the catalytic converter technology for diesel.
from Geochemistry News -- ScienceDaily http://ift.tt/1OKJU8f